Exception handling flow in C++ - Mini Project: Build & Apply

Exception handling flow

📖 Scenario: Imagine you are writing a simple program that divides two numbers. Sometimes, the user might enter zero as the divisor, which causes an error. We want to handle this error gracefully using exception handling.

🎯 Goal: You will create a program that safely divides two numbers by using exception handling flow in C++. You will learn how to throw and catch exceptions to avoid program crashes.

📋 What You'll Learn

Create two integer variables with exact values

Create a function that divides two integers and throws an exception if divisor is zero

Use try-catch blocks to handle the exception

Print the division result or an error message

💡 Why This Matters

🌍 Real World

Exception handling is used in real programs to prevent crashes and handle errors like dividing by zero or file not found.

💼 Career

Understanding exception handling is essential for writing robust C++ applications in software development jobs.

1

DATA SETUP: Create two integer variables

Create two integer variables called numerator and denominator with values 10 and 0 respectively.

C++

// Your code here

Need a hint?

Use int numerator = 10; and int denominator = 0; to create the variables.

2

CONFIGURATION: Create a division function with exception

Write a function called divide that takes two integers a and b. If b is zero, throw a std::runtime_error with the message "Division by zero". Otherwise, return the result of a / b.

C++

int numerator = 10;
int denominator = 0;

// Your code here

Need a hint?

Use throw std::runtime_error("Division by zero") inside the function when b is zero.

3

CORE LOGIC: Use try-catch to handle the exception

Write a try block that calls divide(numerator, denominator) and stores the result in an integer variable called result. Then write a catch block that catches std::runtime_error exceptions and stores the exception message in a variable called error_message.

C++

int numerator = 10;
int denominator = 0;

int divide(int a, int b) {
    if (b == 0) {
        throw std::runtime_error("Division by zero");
    }
    return a / b;
}

// Your code here

Need a hint?

Use try and catch (const std::runtime_error& e) to handle the exception.

4

OUTPUT: Print the result or error message

Write code to print "Result: " followed by result if no exception occurred. Otherwise, print "Error: " followed by error_message.

C++

int numerator = 10;
int denominator = 0;

int divide(int a, int b) {
    if (b == 0) {
        throw std::runtime_error("Division by zero");
    }
    return a / b;
}

int result;
std::string error_message;
try {
    result = divide(numerator, denominator);
} catch (const std::runtime_error& e) {
    error_message = e.what();
}

// Your code here

Need a hint?

Use std::cout to print the result or error message depending on whether error_message is empty.